Examples

The butty was a contractor who engaged with the proprietor or lessee of the mine to deliver the coal or iron-stone at so much per ton, himself hiring the labourers, using his own horses, and supplying the tools requisite for the working of the mine.

"Researchers at Leeds University spent more than 1,000 hours testing 700 variants on the traditional bacon sandwich, which many Britons refer to as a bacon butty (eschewing the term sandwich, said to have been coined to honor the fourth Earl of Sandwich’s habit of eating meat between slices of bread around 1762)."- http://www.nytimes.com/2007/04/11/world/europe/11bacon.html